Results 1 - 10 of 1372
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[en] Different from the usual tetraquark assignment to charged Z(3885) and Z(4025) charmoniumlike structures, in this letter we propose a universal non-resonant explanation to decode these Z’s, which is based on a special dynamical behavior of ee→Dπ. Our study shows that Z(3885) and Z(4025) are only the reflection from the P-wave charmed meson D(2420) involved in ee→Dπ. Obviously, the present work provides a unique perspective, which can be examined by future experiments like BESIII and BelleII.
[en] We have calculated the decay rates of several non-leptonic decays of charmed-mesons, using the spectator model. What distinguishes our approach is that we are able to obtain the decay matrix element of the meson from the constituent quarks' decay matrix element and the bound-state quark-antiquark wavefunction of the meson. The quarks' decay matrix element is calculated from the Standard Model. It is multiplied by the momentum-space wavefunction of the mesons, and integrated over the degrees of freedom of the constituent quarks, to give the decay matrix element of the meson. From this we can obtain the weak decay-rates of the charmed mesons. The wavefunctions we have used are based on a simple harmonic oscillator potential between the quark and the anti-quark. The resulting decay rates and lifetimes of the charmed mesons agree favourably with experimental measurements
[en] The twenty five years that have passed since the experimental discovery of the first charmed particle have been extremely successful for the physics of charmed particles. In the 30 odd experiments conducted over this period, a large number of states of charmed mesons and baryons have been observed, over a thousand decay channels studied, and lifetimes measured. In the present paper, basic experimental results are reviewed and prospects for the near future are discussed. (reviews of topical problems)
[en] Constraints on quark diagrams for exclusive decays from group theory are investigated. In contrast to previous statements, we find a one-to-one correspondence between reduced matrix elements of flavor symmetry (SU3) and the ''naive'' quark diagrams of the spectator and annihilation type. In Cabibbo suppressed decays however, group theory relates penguin and annihilation (W-exchange) diagrams, consequently ruling out models with spectator dominance and large penguins. These results are expected to be more general, having as yet been illustrated for two-body decays of charmed mesons
[en] We present a systematic and self-consistent analysis of four-quark charmonium states and applied it to study compact four-quark systems and meson-meson molecules. Our results are robust and should serve to clarify the situation of charmonium spectroscopy above the threshold production of charmed mesons. (author)
[en] I discuss theoretical implications of recent experimental progress in understanding CP-violation in charmed mesons. I review recent standard model predictions and attempts to constrain beyond the standard model scenarios using observations of charm hadron transitions
[en] The production of the D0 meson in pp collisions at √s= 7TeV through its hadronic decay in Kπππ, using the ALICE detector, is measured. By applying a series of topological cuts and PID selections, signal peaks in the invariant mass distribution M(Kπππ) have been found in different pT bins, ranging from 4.5 to 25 GeV/c. After performing corrections for efficiency, acceptance and feed-down from beauty contribution, differential direct production yield and cross section can be computed and compared to pQCD theoretical predictions which show a good agreement for the shape of the pT-differential cross section.
[en] We present a preliminary calculation of the charmed meson spectrum using the 2+1 flavor domain wall fermion lattice configurations currently being generated by the RBC and UKQCD collaborations. The calculation is performed using the 3-parameter, relativistic heavy quark action with nonperturbatively determined coefficients. We will also demonstrate a step-scaling procedure for determining these coefficients nonperturbatively using a series of quenched, gauge field ensembles generated for three different lattice spacings